Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0d157b3d74f36b…

MALICIOUS

PDF

97.1 KB Created: 2021-09-18 06:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ed9cb1532bd951f3e5ae6b12224815b SHA-1: 4b1be09a399689633241ff9691592e7b05cca449 SHA-256: 4a0d157b3d74f36bca03d94f13ab27a9964b067f35599118c079dd69ee4d2150
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/415323bdf8f3c605b506f83a60953aed/67279615817.pdf In PDF document text
    • http://officinedesign.it/userfiles/files/3708883838.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/pekif.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/vasexefoxoxinava.pdfIn PDF document text
    • http://lizhechem.com/upload/files/25300083265.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/lazofexudimezag.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/oruv5but5da9irgaaqtmm9ve63/zugon.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/53807592823.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/96295456305.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/wimajodudonadoker.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091419104520.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/fuwiw.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/mujebud.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614089b4e93a8---xokelufifamavagujezexor.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/nigimvt7ad8m8e5ci1g77ibc3v/vivojasifafeporofiwuxo.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/95156652340.pdfIn PDF document text
    • http://p-energo.ru/content/file/kimad.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/bizapegerigimotoviga.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/logopadapagu.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/82033885297.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/mikododofukipugoje.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/74415986968.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/2160651156.pdfIn PDF document text
    • http://koutingchina.com/upload/files/1259939801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=minecraft+tower+defense+flash+gamePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 18140 bytes
SHA-256: 02256831dabe3abf2be5dd376bd2c907112cee1e50f73a9c2f6fd770f6de371c
font_01_sfnt_off00014571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14571 11000 bytes
SHA-256: f121644ca847885afa0c7b4ebd860a5f91a7a630be9c384217effb28863b6970
font_02_sfnt_off00015eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1